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The LLC resonant converter is favored in high\u2010frequency, high\u2010power\u2010density settings due to its soft\u2010switching capabilities. However, existing gate driver circuits for LLC converters usually operate at fixed frequencies and duty cycles, failing to address the variable requirements of LLC voltage regulation. Most current variable frequency and duty cycle drivers focus on buck converters, targeting large current handling without optimization for LLC circuits. A dual\u2010channel current\u2010source gate driver for secondary\u2010side MOSFETs in LLC\u2010DCX is proposed in this paper. This circuit enables variable\u2010frequency and duty\u2010cycle control. Specifically for LLC\u2010DCX applications, an optimized design utilizing current\u2010source gate drivers to control the LLC secondary rectifier is presented. The loss mechanisms in current\u2010source drive circuits are analyzed, and a comprehensive loss model for the LLC circuit is established. Key resonant parameters of the driver are optimized along with the dead\u2010time adjustment of the LLC converter. A prototype LLC converter was developed, operating at a resonant frequency of 1.3\u2009MHz. Testing results show that the LLC prototype driven by the current\u2010source gate driver achieves a peak efficiency improvement of 0.67% compared with traditional drivers and recovers 82% of gate drive energy.<\/jats:p>","DOI":"10.1002\/cta.4612","type":"journal-article","created":{"date-parts":[[2025,6,12]],"date-time":"2025-06-12T10:49:45Z","timestamp":1749725385000},"page":"717-727","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["An Optimized Design Method for Enhancing Efficiency of LLC Secondary Side MOSFETs Using Current\u2010Source Gate Driver"],"prefix":"10.1002","volume":"54","author":[{"ORCID":"https:\/\/orcid.org\/0009-0006-6685-4860","authenticated-orcid":false,"given":"Ziyan","family":"Zhou","sequence":"first","affiliation":[{"name":"Southeast University  Nanjing China"}]},{"given":"Song","family":"Ding","sequence":"additional","affiliation":[{"name":"Southeast University  Nanjing China"}]},{"given":"Qi","family":"Liu","sequence":"additional","affiliation":[{"name":"Southeast University  Nanjing China"}]},{"given":"Qinsong","family":"Qian","sequence":"additional","affiliation":[{"name":"Southeast University  Nanjing China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3289-8877","authenticated-orcid":false,"given":"Weifeng","family":"Sun","sequence":"additional","affiliation":[{"name":"Southeast University  Nanjing 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